20165835188 has 6 divisors (see below), whose sum is σ = 35290211586. Its totient is φ = 10082917592.

The previous prime is 20165835187. The next prime is 20165835211. The reversal of 20165835188 is 88153856102.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 11826127504 + 8339707684 = 108748^2 + 91322^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20165835187) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2520729395 + ... + 2520729402.

It is an arithmetic number, because the mean of its divisors is an integer number (5881701931).

Almost surely, 2^20165835188 is an apocalyptic number.

It is an amenable number.

20165835188 is a deficient number, since it is larger than the sum of its proper divisors (15124376398).

20165835188 is a wasteful number, since it uses less digits than its factorization.

20165835188 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5041458801 (or 5041458799 counting only the distinct ones).

The product of its (nonzero) digits is 460800, while the sum is 47.

The spelling of 20165835188 in words is "twenty billion, one hundred sixty-five million, eight hundred thirty-five thousand, one hundred eighty-eight".